Add comparator for .chm files (MS Windows HtmlHelp Data)

.chm files return for file MS Windows HtmlHelp Data, example files:

https://www.php.net/distributions/manual/php_manual_en.chm

https://www.php.net/distributions/manual/php_enhanced_en.chm

files in debian: https://packages.debian.org/search?searchon=contents&keywords=.chm&mode=path&suite=unstable&arch=any

ways to unpack chm files are:

1. package p7zip-full command 7z x file.chm
2. package libchm-bin command extract_chmLib file.chm output_dir
3. package archmage command archmage file.chm output_dir